<template>
  <div class='xtx-goods-page' v-if="goods">
    <div class="container">
      <!-- 面包屑 -->
      <XtxBread>
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <XtxBreadItem :to="`/category/${goods.categories[1].id}`">{{goods.categories[1].name}}</XtxBreadItem>
        <XtxBreadItem :to="`/category/sub/${goods.categories[0].id}`">{{goods.categories[0].name}}</XtxBreadItem>
        <XtxBreadItem>{{goods.name}}</XtxBreadItem>
      </XtxBread>
      <!-- 商品信息 -->
      <div class="goods-info">
        <div class="media">
          <GoodsImage :images="goods.mainPictures"></GoodsImage>
          <GoodsSales></GoodsSales>
        </div>
        <div class="spec">
          <GoodName :goods="goods"></GoodName>
          <!-- sku组件 -->
          <GoodsSku :goods="goods" @change="changeSku"></GoodsSku>
          <!-- 数量组件 -->
          <XtxNumbox v-model="num" :max="goods.inventory" lable="数量"></XtxNumbox>
          <!-- 加入购物车按钮组件 -->
          <XtxButton @click="insertCart" type="primary" style="margin-top: 20px">加入购物车</XtxButton>
        </div>
      </div>
      <!-- 商品推荐 -->
      <GoodsRelevant :goodsId="goods.id" v-if="goods" />
      <!-- 商品详情 -->
      <div class="goods-footer">
        <div class="goods-article">
          <!-- 商品+评价 -->
          <GoodsTabs></GoodsTabs>
          <!-- 注意事项 -->
          <GoodsWarn></GoodsWarn>
        </div>
        <!-- 24热榜+专题推荐 -->
        <div class="goods-aside">
          <GoodsHot></GoodsHot>
          <GoodsHot :type="2"></GoodsHot>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { nextTick, provide, ref, watch } from 'vue'
import GoodsRelevant from './components/goods-relevant'
import GoodsImage from './components/goods-image.vue'
import GoodsSales from './components/goods-sales.vue'
import GoodName from './components/goods-name.vue'
import GoodsSku from './components/goods-sku.vue'
import GoodsHot from './components/goods-hot.vue'
import GoodsTabs from './components/goods-tabs.vue'
import GoodsWarn from './components/goods-warn.vue'
import { findGoods } from '@/api/product.js'
import { useRoute } from 'vue-router'
import { useStore } from 'vuex'
import Message from '@/components/library/Message'
export default {
  name: 'XtxGoodsPage',
  components: { GoodsRelevant, GoodsImage, GoodsSales, GoodName, GoodsSku, GoodsTabs, GoodsHot, GoodsWarn },
  setup() {
    // 1 获取商品详情 进行渲染
    const goods = useGoods()
    const num = ref(1)
    function changeSku(sku) {
      // console.log(sku)
      // 修改商品现价原价库存信息
      if (sku.skuId) {
        goods.value.price = sku.price
        goods.value.oldPrice = sku.oldPrice
        goods.value.inventory = sku.inventory
      }
      // 记录选择后的sku  可能有数据 可能是空对象
      currSku.value = sku
    }
    // 提供goods数据给后代组件使用
    provide('goods', goods)
    // 加入购物车
    const store = useStore()
    const currSku = ref(null)
    function insertCart() {
      // 在加入购物车之前要判断规格是否完整
      if (currSku.value && currSku.value.skuId) {
        // 选择完整了
        const { skuId, specsText: attrsText, inventory: stock } = currSku.value
        const { id, name, price, mainPictures } = goods.value
        store
          .dispatch('cart/insertCart', {
            skuId,
            attrsText,
            stock,
            id,
            name,
            price,
            nowPrice: price,
            picture: mainPictures[0],
            selected: true,
            isEffective: true,
            count: num.value
          })
          .then(() => {
            Message({ type: 'success', text: '加入购物车成功' })
          })
      } else {
        // 选择不完整
        Message({ text: '请选择完整的规格' })
      }
    }
    return { goods, changeSku, num, insertCart }
  }
}
// 获取商品详情
const useGoods = () => {
  // 有可能会出现路由地址的商品ID发生变化 但是不会重新初始化组件
  const goods = ref(null)
  const route = useRoute()
  watch(
    () => route.params.id,
    newVal => {
      if (newVal && `/product/${newVal}` === route.path) {
        findGoods(route.params.id).then(data => {
          // 让商品数据为null让后使用v-if的组件可以重新销毁和创建
          // console.log(data)
          goods.value = null
          nextTick(() => {
            goods.value = data.result
          })
        })
      }
    },
    { immediate: true }
  )

  return goods
}
</script>

<style scoped lang='less'>
.goods-info {
  min-height: 600px;
  background: #fff;
  display: flex;
  .media {
    width: 580px;
    height: 600px;
    padding: 30px 50px;
  }
  .spec {
    flex: 1;
    padding: 30px 30px 30px 0;
  }
}
.goods-footer {
  display: flex;
  margin-top: 20px;
  .goods-article {
    width: 940px;
    margin-right: 20px;
  }
  .goods-aside {
    width: 280px;
    min-height: 1000px;
  }
}
.goods-tabs {
  min-height: 600px;
  background: #fff;
}
.goods-warn {
  min-height: 600px;
  background: #fff;
  margin-top: 20px;
}
</style>
